-
I have a damaged capacitor from a bootleg double dragon arcade pcb and I have the normal values from it:
10 volt, 100uF, 85c, but someone from an arcade forum said that the ripple current is not that critical and any good quality low esr cap would be fine, the damaged one is an electrolytic can type but I don't know what to look for as far as low esr is concerned, can a ceramic capacitor be used instead, the capacitor is going to the +5 volt
I don't know the brand but on the top of the capacitor is stamped "76 F6" if there is a datasheet ide be able to... -
I'm working on one of the PSU's in my backlog today that came out of an NBA Jam arcade machine a year or so ago. The PSU is a Pan Yes brand with a model number PY-TV-C. From what I remember the 12v rail wasn't outputting anything. I opened it up and was reminded that the resistor at R28 had blown it's shell off and I have no idea how to ID a replacement for it. (see pictures) The color bands that are still intact a little are brown, black, missing band/bands, and what I'm assuming is silver. When I check it with my DMM it's reading 100ohms exactly but I don't know if that's what it's supposed...
-
This is about a component in a computer system being a DMA controller.
Interestingly in a circuit diagram for the Nintendo arcade game Donkey Kong Junior from 1982, even though it has a second-source Zilog Z80 compatible CPU, the DMA controller is an Intel type (8257) instead of a Zilog type.
My theory is that at the time, even though there was domestic second source manufacture for the 8257 but not (possibly) for the Zilog type DMA controller and that Nintendo (and a number of others) wanted to be loyal to their country by trying to only source components from Japanese ... -
Hi there!
My friend wants me to help him repair his old-real-vintage strong-hammer machine. Well it's only 90% real as the force applied doesn't lift the weight itself but it is measured and it moves a motor that lifts the weight
I am attaching several pictures of the machine.
It basically has 2 sides, left side has- 2 x 220->12+24v transformers
- 2 relays (1 moves motor UP, other moves motor DOWN)
- IGF and breakers for safety
- Logic board. Receives 24AC and recitifies it into DC. Contains a uC (M80C85)
-
Looking for the schematics for this board - its an offshoot of some Chinese board but branded for Coast to Coast entertainment
I think I narrowed down the issue I am having with the claw to a op comparator that drives a photo transistor, this seems to provide the ground used with a DPDT relay
I am in the process of trying to diagram some of the board, if no one has the schematic i'll probably post what I have traced so far
Working...
😀
😂
🥰
😘
🤢
😎
😞
😡
👍
👎
☕